CaO interaction in the staged combustion of coal. Seventh quarterly technical progress report, April 1, 1982-June 30, 1982

Technical Report · Fri Jul 30 04:00:00 EDT 1982

OSTI ID:5174489

Levy, A; Merryman, E L; Rising, B W

Efforts were directed to the coal combustion studies. Two modifications were made to the methane-coal (M-C) combustor, one, to allow introduction of the pulverized coal into the early postflame zone of the methane flame (in contrast to preflame injection used in previous runs), and the second to provide better control of the postflame temperature zone. The early postflame injection procedure is being used to reduce the effects of methane chemistry, if any, on the coal combustion process. Control of the postflame temperature is important in studying temperature and residence time effects on sulfur retention chemistry. Five runs were made using the postflame injection method. Pulverized coal treated with lime (Ca/S = 3.8) was burned in the modified methane-coal (M-C) burner to examine the sulfur capture potential of the coal at various temperature and equivalence ratios. Data obtained from the fuel-rich M-C firings continue to show a strong correlation between sulfur retention and carbon burnout of the coal as expressed by the equation, Sulfur retention = -0.827 x Carbon burnout +93.7, where sulfur and carbon burnout are expressed as percent. Lowering the temperature of the postflame reaction zone produced the same sulfur retention-carbon burnout relationship shown above. Analysis of the ashes showed that the sulfur was retained as sulfate with little or no sulfides present. Thus, results from the postflame firings this quarter are in agreement with those from the preflame firings last quarter. Progress has been made in obtaining more reliable analyses of the gaseous sulfur-bearing products (e.g., H/sub 2/S, COS and SO/sub 2/) formed in fuel-rich firings. However, it appears that the sulfur retention values from the ash data are more reliable.

• Research Organization: Battelle Columbus Labs., OH (USA)
• DOE Contract Number: AC22-80PC30301
• OSTI ID: 5174489
• Report Number(s): DOE/PC/30301-7; ON: DE82018599
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
DATA
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUEL ADDITIVES
FUELS
INFORMATION
MATERIALS
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RETENTION
SULFATES
SULFUR
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES